|Then how may I help you? |
Normally Dell and other big name companies offer a few ways to return the unit to the as bought state. This is the best way to fix systems in many cases. It is like nuking it from high orbit. The only way to be sure.
There may be a recover partition, ways to create disk, disks offered at sale and disks offered as secondary purchase. What do you have to work with?
All the as bought programs should return. All the add on programs will be lost. You need backup copies of them or original disks.
Problems also may be that you local network would have virus's and usb drives may contain the virus. Be sure to sweep them all.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.